[  316.421464][ T2125] netem: version 1.3
[  391.057932][    C1] 
[  391.058108][    C1] ======================================================
[  391.058399][    C1] WARNING: possible circular locking dependency detected
[  391.058695][    C1] 6.9.0-rc2-virtme #1 Not tainted
[  391.058915][    C1] ------------------------------------------------------
[  391.059195][    C1] swapper/1/0 is trying to acquire lock:
[  391.059417][    C1] ffff888003e03918 (&hashinfo->ehash_locks[i]){+.-.}-{2:2}, at: tw_timer_handler+0xe9/0x130
[  391.059905][    C1] 
[  391.059905][    C1] but task is already holding lock:
[  391.060225][    C1] ffffc900001d8d68 ((&tw->tw_timer)){+.-.}-{0:0}, at: call_timer_fn+0xe8/0x230
[  391.060647][    C1] 
[  391.060647][    C1] which lock already depends on the new lock.
[  391.060647][    C1] 
[  391.061082][    C1] 
[  391.061082][    C1] the existing dependency chain (in reverse order) is:
[  391.061460][    C1] 
[  391.061460][    C1] -> #1 ((&tw->tw_timer)){+.-.}-{0:0}:
[  391.061779][    C1]        __lock_acquire+0xaf0/0x1570
[  391.062021][    C1]        lock_acquire.part.0+0xeb/0x330
[  391.062242][    C1]        __timer_delete_sync+0xe1/0x110
[  391.062478][    C1]        inet_twsk_deschedule_put+0xec/0x150
[  391.062741][    C1]        inet_twsk_purge+0x4c8/0x660
[  391.062985][    C1]        tcp_twsk_purge+0x112/0x160
[  391.063199][    C1]        tcp_sk_exit_batch+0x17/0x120
[  391.063428][    C1]        cleanup_net+0x4f3/0xa20
[  391.063659][    C1]        process_one_work+0xe2c/0x1730
[  391.063889][    C1]        worker_thread+0x587/0xd30
[  391.064100][    C1]        kthread+0x28a/0x350
[  391.064322][    C1]        ret_from_fork+0x31/0x70
[  391.064542][    C1]        ret_from_fork_asm+0x1a/0x30
[  391.064766][    C1] 
[  391.064766][    C1] -> #0 (&hashinfo->ehash_locks[i]){+.-.}-{2:2}:
[  391.065115][    C1]        check_prev_add+0x182/0xce0
[  391.065341][    C1]        validate_chain+0x71d/0x9b0
[  391.065580][    C1]        __lock_acquire+0xaf0/0x1570
[  391.065813][    C1]        lock_acquire.part.0+0xeb/0x330
[  391.066038][    C1]        _raw_spin_lock+0x30/0x40
[  391.066263][    C1]        tw_timer_handler+0xe9/0x130
[  391.066494][    C1]        call_timer_fn+0x13b/0x230
[  391.066709][    C1]        __run_timers+0x545/0x810
[  391.066925][    C1]        run_timer_softirq+0x7a/0x1b0
[  391.067143][    C1]        __do_softirq+0x1f8/0x5df
[  391.067366][    C1]        irq_exit_rcu+0x97/0xc0
[  391.067582][    C1]        sysvec_apic_timer_interrupt+0x75/0x80
[  391.067846][    C1]        asm_sysvec_apic_timer_interrupt+0x1a/0x20
[  391.068110][    C1]        default_idle+0xf/0x20
[  391.068337][    C1]        default_idle_call+0x6d/0xb0
[  391.068553][    C1]        cpuidle_idle_call+0x1f4/0x280
[  391.068782][    C1]        do_idle+0xf9/0x160
[  391.069011][    C1]        cpu_startup_entry+0x54/0x60
[  391.069233][    C1]        start_secondary+0x21c/0x2b0
[  391.069464][    C1]        common_startup_64+0x12c/0x138
[  391.069693][    C1] 
[  391.069693][    C1] other info that might help us debug this:
[  391.069693][    C1] 
[  391.070103][    C1]  Possible unsafe locking scenario:
[  391.070103][    C1] 
[  391.070434][    C1]        CPU0                    CPU1
[  391.070645][    C1]        ----                    ----
[  391.070862][    C1]   lock((&tw->tw_timer));
[  391.071086][    C1]                                lock(&hashinfo->ehash_locks[i]);
[  391.071413][    C1]                                lock((&tw->tw_timer));
[  391.071674][    C1]   lock(&hashinfo->ehash_locks[i]);
[  391.071924][    C1] 
[  391.071924][    C1]  *** DEADLOCK ***
[  391.071924][    C1] 
[  391.072248][    C1] 1 lock held by swapper/1/0:
[  391.072468][    C1]  #0: ffffc900001d8d68 ((&tw->tw_timer)){+.-.}-{0:0}, at: call_timer_fn+0xe8/0x230
[  391.072862][    C1] 
[  391.072862][    C1] stack backtrace:
[  391.073131][    C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.9.0-rc2-virtme #1
[  391.073455][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  391.073908][    C1] Call Trace:
[  391.074078][    C1]  <IRQ>
[  391.074195][    C1]  dump_stack_lvl+0x82/0xd0
[  391.074419][    C1]  check_noncircular+0x2f9/0x3e0
[  391.074633][    C1]  ? get_stack_info+0x35/0xc0
[  391.074862][    C1]  ? __pfx_check_noncircular+0x10/0x10
[  391.075082][    C1]  ? common_startup_64+0x12c/0x138
[  391.075305][    C1]  ? alloc_chain_hlocks+0x4e0/0x720
[  391.075531][    C1]  check_prev_add+0x182/0xce0
[  391.075748][    C1]  validate_chain+0x71d/0x9b0
[  391.075971][    C1]  ? __pfx_validate_chain+0x10/0x10
[  391.076192][    C1]  ? hlock_class+0x4e/0x130
[  391.076412][    C1]  ? mark_lock+0x38/0x3e0
[  391.076576][    C1]  __lock_acquire+0xaf0/0x1570
[  391.076803][    C1]  ? __pfx_tw_timer_handler+0x10/0x10
[  391.077021][    C1]  lock_acquire.part.0+0xeb/0x330
[  391.077235][    C1]  ? tw_timer_handler+0xe9/0x130
[  391.077452][    C1]  ? __pfx_tw_timer_handler+0x10/0x10
[  391.077663][    C1]  ? lock_acquire.part.0+0xeb/0x330
[  391.077884][    C1]  ? __pfx_lock_acquire.part.0+0x10/0x10
[  391.078106][    C1]  ? trace_lock_acquire+0x135/0x1c0
[  391.078321][    C1]  ? tw_timer_handler+0xe9/0x130
[  391.078531][    C1]  ? lock_acquire+0x32/0xc0
[  391.078759][    C1]  ? tw_timer_handler+0xe9/0x130
[  391.078976][    C1]  _raw_spin_lock+0x30/0x40
[  391.079196][    C1]  ? tw_timer_handler+0xe9/0x130
[  391.079418][    C1]  tw_timer_handler+0xe9/0x130
[  391.079686][    C1]  call_timer_fn+0x13b/0x230
[  391.080061][    C1]  ? call_timer_fn+0xe8/0x230
[  391.080281][    C1]  ? call_timer_fn+0xe8/0x230
[  391.080507][    C1]  ? __pfx_call_timer_fn+0x10/0x10
[  391.080743][    C1]  ? mark_lock+0x38/0x3e0
[  391.080931][    C1]  __run_timers+0x545/0x810
[  391.081163][    C1]  ? __pfx_tw_timer_handler+0x10/0x10
[  391.081399][    C1]  ? __pfx___run_timers+0x10/0x10
[  391.081770][    C1]  ? do_raw_spin_lock+0x131/0x270
[  391.082011][    C1]  ? __pfx_do_raw_spin_lock+0x10/0x10
[  391.082238][    C1]  ? lock_acquire+0x32/0xc0
[  391.082462][    C1]  ? run_timer_softirq+0x72/0x1b0
[  391.082808][    C1]  run_timer_softirq+0x7a/0x1b0
[  391.083014][    C1]  __do_softirq+0x1f8/0x5df
[  391.083216][    C1]  irq_exit_rcu+0x97/0xc0
[  391.083364][    C1]  sysvec_apic_timer_interrupt+0x75/0x80
[  391.083701][    C1]  </IRQ>
[  391.083816][    C1]  <TASK>
[  391.083917][    C1]  asm_sysvec_apic_timer_interrupt+0x1a/0x20
[  391.084160][    C1] RIP: 0010:default_idle+0xf/0x20
[  391.084389][    C1] Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 13 63 2b 00 fb f4 <fa> c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
[  391.085298][    C1] RSP: 0018:ffffc9000014fdf8 EFLAGS: 00000242
[  391.085569][    C1] RAX: 00000000008136d3 RBX: 1ffff92000029fc1 RCX: ffffffffa2dab865
[  391.086142][    C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffa06aa3b4
[  391.086473][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ed709c
[  391.086842][    C1] R10: ffff88802f6b84e3 R11: ffff88802f6ad9b0 R12: 0000000000000000
[  391.087139][    C1] R13: ffff888001b82300 R14: dffffc0000000000 R15: 0000000000000000
[  391.087459][    C1]  ? ct_kernel_exit.constprop.0+0xc5/0xf0
[  391.087675][    C1]  ? cpuidle_idle_call+0x1f4/0x280
[  391.087885][    C1]  default_idle_call+0x6d/0xb0
[  391.088094][    C1]  cpuidle_idle_call+0x1f4/0x280
[  391.088294][    C1]  ? __pfx_cpuidle_idle_call+0x10/0x10
[  391.088494][    C1]  ? tsc_verify_tsc_adjust+0x5e/0x2b0
[  391.088824][    C1]  do_idle+0xf9/0x160
[  391.088979][    C1]  cpu_startup_entry+0x54/0x60
[  391.089318][    C1]  start_secondary+0x21c/0x2b0
[  391.089515][    C1]  ? __pfx_start_secondary+0x10/0x10
[  391.089735][    C1]  common_startup_64+0x12c/0x138
[  391.090076][    C1]  </TASK>